NOTICE ADVISORY TO GALILEO USERS (NAGU) YYYYNNN
DATE GENERATED (UTC): YYYY-MM-DD hh:mm

NAGU TYPE: GENERAL (LEAP SECOND)
NAGU NUMBER: YYYYNNN
NAGU SUBJECT: LEAP SECOND
NAGU REFERENCED TO: N/A
START DATE EVENT (UTC): YYYY-MM-DD hh:mm
END DATE EVENT (UTC): YYYY-MM-DD hh:mm
SATELLITE AFFECTED: ALL

EVENT DESCRIPTION: THE INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) HAS ANNOUNCED THE INTRODUCTION OF A LEAP SECOND TO OCCUR AT THE END OF MONTH YYYY.

COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS:
 DD MM YYYY hh HOURS mm MINUTES ss SECONDS
 DD MM YYYY hh HOURS mm MINUTES ss SECONDS
 DD MM YYYY hh HOURS mm MINUTES ss SECONDS

USERS ARE ADVISED THAT THE UTC DATA IN THE GALILEO NAVIGATION MESSAGE WILL CHANGE IN ACCORDANCE WITH OS SIS ICD (SECTION x.y.z).

BEFORE THE LEAP SECOND GST-UTC IS XX (GST IS AHEAD OF UTC BY XX SECONDS) AFTER THE LEAP SECOND GST-UTC WILL BE YY (GST WILL BE AHEAD OF UTC BY YY SECONDS)